What causes the noise when stepping on the brake while driving?

[ORiley]

When stepping on the brake while driving, the noise is caused by worn-out brake discs or brake pads. You should check the thickness of the brake pads yourself and inspect the brake discs for obvious scratches caused by friction. If the brake pads are less than 5 millimeters thick, they must be replaced. Brake noise is a common issue, especially noticeable when pressing the brake pedal at medium to low speeds. Car brake pads, also known as brake linings, are friction materials fixed to the brake drums or discs that rotate with the wheels. The friction linings and blocks bear external pressure, generating friction to achieve the purpose of vehicle deceleration.

[VanGenesis]

I recently encountered a similar issue while driving—a sharp squealing noise when braking, which was quite annoying. This usually happens when the brake pads are severely worn, and the metal backing plate directly rubs against the brake disc, producing a 'squeaky' sound. It could also be due to rust or unevenness on the brake disc, especially after rain or prolonged periods of inactivity. I recommend getting it checked immediately, as continuing to drive could accelerate brake disc wear, and replacing them later would be more expensive. When parking, avoid braking too hard to reduce the chances of the noise occurring. However, it's best to have it inspected at a repair shop to avoid potential safety hazards.

[Blake]

My car occasionally makes strange noises, especially when braking at low speeds. This issue might be related to scratches on the brake disc surface or small stones stuck in it. I encountered this problem right after I bought the car. Just think about it—when mud splashes into the braking system and mixes with the friction material, it can produce a screeching sound. This affects braking distance, so it needs careful handling. I tried gently releasing the brake and then pressing it slowly again, and sometimes the noise disappears. But if it persists, it’s worth checking whether too much dust has accumulated, and cleaning the components. Don’t ignore such minor issues; delaying could lead to faster wear and tear.

[StDiana]

Common causes of brake noise in cars include worn-out brake pads, which can cause a metal-on-metal scraping sound, or improperly retracted calipers in the brake system. This happened to my old car, and the inspection revealed an aging hydraulic pump. Address it immediately—safety comes first.

[LeAriel]

I often hear noises when braking on rainy days, probably caused by rust or moisture on the brake discs creating friction. If not addressed promptly, braking performance deteriorates, especially on curves where loss of control is more likely. I've developed a habit of regular inspections, clearing debris from the inside of the wheels, which has reduced the noise a bit. Safety is no small matter; early repair is the best policy.

[DelAngelo]

My beloved car makes a whistling sound when braking, which is mostly due to the running-in period of a new car or too much dust. Check the thickness of the brake pads; if they are too thin, it's time to replace them. I always keep an eye on this during every maintenance, and it's easily resolved.